JPH055529A - Heating and cooking device - Google Patents

Abstract

PURPOSE:To enable a shortening of rising time of a heater to be realized without using any temperature sensor by a method wherein the rising state of the heater is judged in response to an electrical energization time for the heater and an elapsing time after stopping the operation of the heater and a cooling fan is operated. CONSTITUTION:A control means 103 drives a cooling fan in the case that an electrical energization for a resistance heating heater is continued for more than a specified electrical energization time or in the case that the electrical energization for the resistance heating heater is restarted before the specified stopping time elapses. Accordingly, when the heating is started, a cooling fan 104 is driven after a temperature of the heater is sufficiently increased and when the heating is restarted, the cooling fan 104 is driven before a temperature of the heater is not excessively decreased, so that a rising characteristic of temperature at the time of electrical energization of the heater is not influenced by a cooling action of the cooling fan 104. That is, in case it is judged that the heater is already risen, the cooling fan is rotated when the operation is started so as to prevent a temperature of the device from being increased and in turn when the temperature is lowered, the cooling fan is operated after a specified time from the starting of the electrical energization of the heater.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker having a resistance heating heater.

[0002]

2. Description of the Related Art In conventional heating cookers of this type,
A heating chamber provided inside the case, a resistance heater that heats food installed in the heating chamber, and a cooling fan that cuts off heat conduction from the heating chamber to the case by ventilating the gap between the case and the heating chamber. It is known that the cooling fan is rotated when the temperature in the refrigerator exceeds a certain temperature in consideration of the rise time of the heater during cooking (for example, JP-A-58-175290). See the bulletin).

[0003]

However, in such a conventional cooking device, a temperature detection sensor and its detection circuit are required to detect the heat generation state of the heater.
Configuration becomes complicated.

The present invention has been made in view of such circumstances, and provides a heating cooker having a simple structure by controlling the operation of a cooling fan by a timer.

[0005]

According to the present invention, there is provided a heating chamber provided inside a case, a resistance heater installed in the heating chamber for heating food, and a ventilation chamber provided between the case and the heating chamber. In a heating cooker equipped with a cooling fan that shuts off heat conduction from the chamber to the case, there is provided a first timing means for timing a predetermined energizing time after the energization of the resistance heating heater is started, and A second timing means for counting a predetermined stop time and a control means for driving the cooling fan when the energization of the resistance heater continues for a predetermined energization time or longer or is resumed before the predetermined stop time elapses A heating cooker characterized by the above.

FIG. 1 is a block diagram showing the basic structure of the present invention. Reference numeral 101 is a first timing means for measuring a predetermined energizing time after the energization of the resistance heating heater is started, and 102 is an energization stop of the resistance heating heater. Second to measure the predetermined stop time after
The time counting means 103 is a control means for driving the cooling fan 104 when the energization of the resistance heater is continued for a predetermined energization time or longer or is resumed before the elapse of a predetermined stop time.

[0007]

In FIG. 1, the control means 103 drives the cooling fan when the energization of the resistance heater is continued for a predetermined energization time or longer or is resumed before the elapse of the predetermined stop time.

Therefore, at the start of heating, the cooling fan 104 is driven after the temperature of the heater has sufficiently risen, and when the heating is restarted, the cooling fan 1 is operated while the heater temperature does not drop excessively.
Since 04 is driven, the rising characteristic of the temperature when the heater is energized is not affected by the cooling action of the cooling fan 104.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiments shown in the drawings. This does not limit the invention.

FIG. 2 is an explanatory view of the configuration of a heating cooker showing an embodiment of the present invention, and FIG. 3 is a block diagram of a control circuit of the heating cooker shown in FIG.

In these figures, 1 is a display unit for displaying cooking conditions, 2 is a key input unit for inputting cooking conditions, cooking start commands, etc., 3 is a microcomputer (hereinafter referred to as a microcomputer), 4 is a cooking device. A door detection unit for detecting opening and closing of the door by the door switch 5, a notifying unit (for example, a buzzer) for notifying the user of finishing or other information in cooking, 7 a heater driving unit for energizing the resistance heating heater 8, Reference numeral 9 is a cooling fan drive unit for driving the cooling fan 10, 11 is a case of a heating cooker, 12 is a heating chamber provided inside the case 11, 13 is a turntable, and 14 is a focus table installed on the turntable 13. Food 15
Is a food support table for placing the.

The resistance heating heater 8 is installed on the ceiling of the heating chamber 12. Then, the cooling fan 10 blows the air blown from the intake hole 16 to the exhaust hole 17 of the case 11 through the gap between the case 11 and the heating chamber 12, and blocks the heat conduction from the heating chamber 12 to the case 12. It is like this.

The microcomputer 3 receives the outputs from the key input unit 2 and the door detection unit 4, and controls the display unit 1, the notification unit 6, the heater driving unit 7, and the cooling fan driving unit 9.

In such a structure, when the cooking condition is input from the key input unit 2 and the cooking start command is further input, it is confirmed that the door is closed, and then the resistance heater 8 is turned on. Energization is started. Then, when the timer built in the microcomputer 3 finishes measuring the heater energization time of 1 minute (the period required for the temperature of the heater 8 to rise), the cooling fan 10 is driven. In addition, when cooking is completed and the energization of the resistive heater 8 and the driving of the cooling fan 10 are stopped, the timer of the microcomputer 3 sets a heater stop time of, for example, 2 minutes (a period in which the heater temperature does not drop much). ) When the cooking is started again and the resistance heating heater 8 is energized by the time
The cooling fan 10 is driven immediately.

The above operation will be described in more detail with reference to the flow charts shown in FIGS. When the input power of the heating cooker is turned on, the microcomputer 3 is reset, and the microcomputer 3 starts the program from step S1. In step S2, the fanon flag that controls the cooling fan at the start of heater operation is reset. In the subsequent step S3, the time, the cooking time and the like are displayed on the display unit 1.

In step S4, the key input from the key input section 2 is discriminated. If the key input is present, step S4 is performed.
26, and if nothing, go to step S6, where
If the heater operation is set and the start instruction is given from the key input unit 2, the program goes through steps S27, S28, and S2.
Proceed to step 9 and set the BSYH flag indicating that the heater is operating.

In the subsequent step S30, the heater driving unit 7 is turned on.
Then, the heater 8 is energized. In step S31, the cooling fan drive mode is checked, and when the power is turned on F
Since the ANO N flag is 0, program step S3
Go to.

When the heater operation is started, the program proceeds to steps S3 to S7 and then to step S13 to check the open / closed state of the door. If it is closed, the program proceeds to step S15 to set the heater energization time. When the energization time to the heater for counting exceeds a certain value (1 minute in this embodiment), it is determined that the heater has been started,
The elapsed time THOFF after the heater is stopped in step S18
Is set to 0, and in the following step S19, the cooling fan drive unit 9
Is turned on and the cooling fan 10 is rotated. Step S20
Then, FANON that controls the cooling fan at the start of heater operation
Set the flag.

After step S21, a subtraction process of the operating time T is executed. After that, if the subtraction result of the operating time T becomes zero, the program proceeds to step S23, notifies the notifying unit 6 of the end, and continues to step S24,
The heater 8 and the cooling fan 10 are turned off at S25.
Then, in the subsequent step S26, it is shown that the heater is in operation, the BSY flag is reset, and the heater operation is ended.

When the heater operation is completed, the program proceeds to step S8 through steps S3 to S7 and counts the elapsed time THOFF after the heater is stopped. When the elapsed time after stopping the heater exceeds a certain value (two minutes in this embodiment), the steps S9 and S10 are performed, and then the subsequent step S1.
At 1, the heater energization time count THON is set to 0, and at the subsequent step S12, the cooling fan 1 at the start of heater operation
Reset the FANON flag that controls 0.

As described above, in this embodiment, when performing continuous operation using the resistance heater, the previous heater heating is 1 minute or more, and the heater heating is stopped and the elapsed time after the end is less than 2 minutes. If so, it is determined that the temperature of the heater and the inside of the refrigerator have risen, and the cooling fan is operated from the start of operation,
If the previous heating of the heater is less than 1 minute or the elapsed time after the end of the heating of the heater is 2 minutes or more, it is determined that the temperature of the heater and the inside of the refrigerator have not risen, and the cooling fan operation starts 1 minute after the start of operation Excuse me.

[0022]

According to the present invention, when the heater is operated in the cooker having the heater function, the rising state of the heater is judged from the energization time to the heater and the elapsed time after the heater is stopped, and the heater is already started. If it is determined that the cooling fan is rotating from the start of operation to prevent the temperature of the unit from rising, and if it is determined that the heater is down, the cooling fan is operated after a fixed time from the start of heater energization. This makes it possible to shorten the heater startup time without using a temperature sensor.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of the present invention.

FIG. 2 is a structural explanatory view of a heating cooker showing an embodiment of the present invention.

FIG. 3 is a block diagram of a control circuit of the heating cooker of FIG.

FIG. 4 is a flowchart showing the operation of the embodiment.

FIG. 5 is a flowchart showing the operation of the embodiment.

[Explanation of symbols]

 1 Display Section 2 Key Input Section 3 Microcomputer 4 Door Detection Section 5 Door Switch 6 Notification Section 7 Heater Drive Section 8 Resistance Heater 9 Cooling Fan Drive Section 10 Cooling Fan

Claims (1)

Claim: What is claimed is: 1. A heating chamber provided inside a case, a resistance heater installed in the heating chamber for heating food, and a heating chamber that ventilates a gap between the case and the heating chamber. In a heating cooker equipped with a cooling fan that cuts off heat conduction to the case, a first timing means for timing a predetermined energization time after the energization of the resistance heater is started, and a predetermined stop after energization of the resistance heater is stopped. A second timing means for timing the time, and a control means for driving the cooling fan when the energization of the resistance heater is continued for a predetermined energization time or longer or is resumed before the elapse of a predetermined stop time are provided. Cooker characterized by.